Analysis And Countermeasure Of Abnormal Running - Hitachi RCUE40AG2 Service Manual

Troubleshooting

5.3. Analysis and countermeasure of abnormal running

Chiller unit has various kinds of protection devices. When the operation status is not correct due to the activation of
some protection device, refer to the table below and fi nd out the main reason to apply a countermeasure.
One failure can affect other different conditions. Thus, do not check only 1 point but analyze it from overall viewpoint
in detail.
Phenomenon
Fuse for
power
source is
melted
Fuse for
operation
circuit is
melted
It does not
run when
operate
Remote Control Wiring Incorrect Remote Control Wiring Incorrect Remote Control Wiring Incorrect Remote Control Wiring Incorrect Remote Control Wiring Incorrect Remote Control Wiring Incorrect Remote Control Wiring Incorrect
R, S, T phase of power source is phase R, S, T phase of power source is phase R, S, T phase of power source is phase R, S, T phase of power source is phase
failure or reverse phase. (05 alarm) failure or reverse phase. (05 alarm) failure or reverse phase. (05 alarm) failure or reverse phase. (05 alarm)
Remote Control Switch Failure. Change-over Remote Control Switch Failure. Change-over Remote Control Switch Failure. Change-over Remote Control Switch Failure. Change-over
switch of Printed Circuit Board is "Local" (40
Printed
Circuit
Board
Failure
Pump
Magnetic
Contactor
for Pump
Failure
(52P) (52P)
Pump
Over-
Pump stops
current
before
Relay
compressor
Activated
running
(TRP) (5P
Alarm)
pag. 141
SMGB0003 rev.0 - 01/2007
Cause
Power Failure
Power is OFF
Wiring Short Circuit
Wiring Earth Fault
Compressor Motor Failure Compressor Motor Failure Compressor Motor Failure
Fan Motor Failure Fan Motor Failure
Wiring Short-circuit
Earth Fault in Operation Earth Fault in Operation
Circuit Circuit
Magnetic Contactor for
Compressor Motor Failure Compressor Motor Failure
Magnetic Contactor Magnetic Contactor
for Fan Motor Failure for Fan Motor Failure
Magnetic Contactor Magnetic Contactor
for pump motor Failure for pump motor Failure
Auxiliary Relay Coil Failure Auxiliary Relay Coil Failure Auxiliary Relay Coil Failure
Solenoid Valve Coil Failure Solenoid Valve Coil Failure Solenoid Valve Coil Failure
Printed Circuit Board Short-
Circuit
Crankcase Heater Failure Crankcase Heater Failure Crankcase Heater Failure
Trans Coil Failure
alarm) alarm)
Wiring Connection Failure
Printed Circuit Board Failure
Breaking of Coil
Loose Connection
Pump locked
Pump Over-current
relay RC Value Wrong
Pump over-current
relay failure
Check Point
Measure voltage by tester.
Check power switch.
Check falling of wiring coating.
Measure insulation resistance.
Measure the interphase
resistance, insulation resistance.
Check falling of wiring device.
Measure insulation resistance.
Measure the coil resistance.
Conductive Foreign Particle.
Measure resistance. Measure resistance.
Measure the transformer Measure the transformer
secondary voltage. secondary voltage.
Wiring Wiring
Check the connection Check the connection
of R, S, and T phase of R, S, and T phase
Check changeover switch.
Check the current by tester.
Measure the voltage of contact
point of magnetic contactor
Check water freeze, clogging
of foreign particle.
Check the RC value and
pump running current.
Push reset button
and check running current.
Countermeasure
Wait the recovery of power source
Power Switch ON
Eliminate short-circuit and replace
fuse. fuse.
Eliminate the earth fault and replace Eliminate the earth fault and replace
fuse. fuse.
Replace compressor and fuse. Replace compressor and fuse. Replace compressor and fuse.
Replace fan motor and fuse Replace fan motor and fuse Replace fan motor and fuse
Eliminate short-circuit and replace
fuse.. fuse..
Eliminate earth fault and replace fuse
Replace magnetic contactor and fuse.
Replace auxiliary relay and fuse. Replace auxiliary relay and fuse. Replace auxiliary relay and fuse.
Replace solenoid coil and fuse. Replace solenoid coil and fuse. Replace solenoid coil and fuse.
Remove the particle and replace fuse
Replace oil heater and fuse. Replace oil heater and fuse. Replace oil heater and fuse.
Replace transformer.
Change wiring. Change wiring. Change wiring.
Change to the correct phase.
Replace remote control switch.
Turn changeover switch on "Remote
Repair the wiring connection
Replace the Printed Circuit Board
Replace magnetic contactor for pump
Remove it.
Change the RC value or
replace magnetic contactor.
Replace magnetic contactor.
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